The ACTN4 Knockout THP-1 Cell Line is a CRISPR/Cas9-edited knockout cell line that provides a loss-of-function model for the ACTN4 gene in the human THP-1 acute monocytic leukemia background. This cell line employs CRISPR/Cas9-mediated gene disruption to eliminate ACTN4 expression, enabling precise dissection of ??-actinin-4 functions in cytoskeletal dynamics and cell motility.
THP-1 cells are derived from the peripheral blood of a patient with acute monocytic leukemia and grow as a suspension culture. Upon treatment with phorbol esters, these cells differentiate into adherent, macrophage-like cells characterized by enhanced phagocytic activity. As a widely adopted model for monocyte/macrophage biology, THP-1 cells are instrumental in studies of immune response, differentiation, and phagocytosis.
ACTN4 is an actin-bundling protein that cross-links filamentous actin (F-actin) into contractile bundles and anchors them to integrin-rich focal adhesions. Its activity is stimulated by upstream signals from the PI3K/AKT pathway and TGF-?? receptors, as well as by mechanical cues through integrin engagement. ACTN4 directly interacts with adhesion complex components including integrin ??1/??3, vinculin, talin, focal adhesion kinase (FAK), and palladin. These interactions promote actin stress fiber formation and actomyosin contractility, which are regulated by Rho family GTPases. Downstream effects include upregulation of matrix metalloproteinases (MMPs) and induction of epithelial-mesenchymal transition (EMT)-like programs, collectively facilitating enhanced cell migration and invasion.
In the THP-1 macrophage model, ACTN4 knockout disrupts the actin cytoskeletal rearrangements critical for adhesion, spreading, and directed migration. These processes underpin key immune functions such as chemotaxis and phagocytosis, making this knockout cell line valuable for exploring the intersection of cytoskeletal organization and innate immunity. Moreover, since THP-1 cells are used to model tumor-associated macrophages, the ACTN4 knockout provides a tool to study how actin-bundling influences the tumor microenvironment and metastatic behavior.
The ACTN4 Knockout THP-1 Cell Line is suited for a broad range of experimental applications, including Boyden chamber migration assays, Matrigel invasion assays, wound healing assays, and phagocytosis measurements. It permits immunocytochemical visualization of F-actin and focal adhesion markers, as well as biochemical interrogation by western blotting and co-immunoprecipitation of signaling complexes involving PI3K/AKT, FAK, or integrins. This model supports screening of anti-metastatic compounds and mechanistic studies of cell motility and adhesion pathways. For further inquiries, please contact Ascent Research.
